[Ada] No subdir creations in externally built projects

[Arnaud Charlet <charlet at adacore dot com>]

When a GNAT tool such as gnatmake is called with --subdirs=, the actual
directories (except source directories) are subdirectories of the
specified (or default) directories. If these subdirectories do not exist
they are created automatically. However, this should not happen in
externally built projects. This patch removes the creation of subdirs
in externally built directories: if the subdir does not exist, then the
specified (or default) directory is used.
The test for this is to invoke gnatmake with --subdirs= and a project
file that imports an externally built project: the subdirs should not
be created for the externally built project.

Tested on x86_64-pc-linux-gnu, committed on trunk

2009-04-15  Vincent Celier  <celier@adacore.com>

	* prj-nmsc.adb (Locate_Directory): New Boolean parameter
	Externally_Built indicating if the project is externally built. If it
	is, and --subdirs is specified, but the subdir does not exist, look
	for the specified directory, without the subdir.

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